Had that happen at a bank after they laid me off. Took three phone calls over three months to get them to stop paying me. They told me that someone would call, and we'd politely discuss what happened, during the first two times I called, but nobody did, instead they froze my account and bounced my rent cheque. Then some stupid person accused me of attempting fraud. Made me kind of glad to be gone. They eventually apologized and unbounced the cheque.
At another bank, someone took out a loan for $1,000 and was paying it back with my bank account and money. They fixed it, although I think they screwed me on the interest, and I never heard who made the mistake, if it was one.